Fragmentation of Methanol Molecules after Core Excitation and Core Ionization Studied by Negative-Ion/Positive-Ion Coincidence Experiments

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Fragmentation of Methanol Molecules after Core Excitation and Core Ionization Studied by Negative-Ion/Positive-Ion Coincidence Experiments

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Publication Article, peer reviewed scientific
Title Fragmentation of Methanol Molecules after Core Excitation and Core Ionization Studied by Negative-Ion/Positive-Ion Coincidence Experiments
Author Kivimäki, Antti ; Stråhlman, Christian ; Richter, Robert ; Sankari, Rami
Date 2018
English abstract
We have studied the fragmentation of the methanol molecule after core excitation and core ionization by observing coincidences between negative and positive ions. Five different negative ions – H-, C-, CH-, O-, and OH- – were observed at both the C 1s and O 1s edges. As negative ion formation occurs after resonant and normal Auger decay of core-hole states, it is necessarily linked with the release of positively charged fragments. Our data show that such fragmentation can happen in many different ways: We found approximately 30 negative-ion/positive-ion/positive-ion coincidence (NIPIPICO) channels. All involve only singly charged positive ions. Fragmentation channels leading to atomic ions are the most probable, but positive molecular ions are also frequently found in the context of anion formation. Coincidence yields as a function of photon energy were determined for the most intense NIPIPICO channels. Adding together the data measured at different photon energies, we could also verify the occurrence of four-ion coincidences, which involved one negative ion (H- or O-) and three positive ions.
DOI https://doi.org/10.1021/acs.jpca.7b11250 (link to publisher's fulltext.)
Publisher American Chemical Society
Host/Issue The Journal of Physical Chemistry A;1
Volume 122
ISSN 1089-5639
Pages 224-233
Language eng (iso)
Subject molecular physics
sychrotron radiation
Sciences
Research Subject Categories::NATURAL SCIENCES
Handle http://hdl.handle.net/2043/24252 Permalink to this page
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